George c



June 15 1926. 1 1,589,088

G. c. ANTHO'N VACUUM BOTTLE Filed March 5, 1921 Til) tures 1],. The dished portion is furtherniore covered with a pad of steel wool 12, and this in turn overlaid with a piece of Wire netting 14;, of suitably fine mesh, the edges of the netting being preferably spot-welded to the surface of the baffle. The battle having been shoved up into position about as shown in Figure 1, the inner Wall of the outside shell 6 is carefully cleaned below the spring-flange 10, and then the inner or true bottom 15, which has a depending periph eral spring-flange '16 and is centrally dished, shoved up into position until it contacts with the flange of the baftle 9. Thereupon, the flange portion 16 of the true bottom 15 is welded to the inner wall of the outside shell 6. The dished portion of the true bottom 15 is provided with a pump-connection tube 17, through which suction is applied to the vacuous space.

It has been found that with "a construction such as described, if the filler of the vacuo'u's space were composed of finely divided charcoal, a considerable proportion of the same would be drawn out to the pump, es-

caping through the apertures 11 and between the spring-flange 10 and the inner wall of the shell 6. However, by making that part of the filler body which directly overlies the battle 9 of such a material as silocell, not so finely divided as the charcoal, and somewhat compacted, I find that there is substantially no loss of the filler material due to the 'action of the pump, and that after the pumping operation the bottle shows a distinctly better thermal efiiciency, Whether this be due to the use of a charcoal filler throughout the greater part of the vacuum space, or to the fact that a more effective pumping is possible.

The use of the barrier 9 is important, because it enables me to hold the filler in position so that the entire surface of the shell 6 maybe cleaned, as is necessary in preparingfor the welding into position of the true bottom 15. The spring flange 10 in itself accomplishes a wiping or cleaning action as it is shoved into position and holds the barrier while the "inner wall of the shell 6 is additionally cleaned off. The screen 1-4 and the steel Wool pad 12, and particularly the latter, are used to prevent the escape of the silocell during pumping. After the pumping operation the tube 17 is slid off in the usual Way and then a false bottom 18 is fitted over the end of the shell 6 and suitably secured to give the desired finish to the article.

It will be understood that I contemplate no limitations as to the materials which may be employed, so long as they answer the purposes which l have in mind. Thus, while I specify the use of finely divided wood charcoal as a filler for the major part of the vacuous space, and a less finely divider silocell as a filler and barrier pad between the charcoal and the batlle, I may use other materials having similar properties. For instance, in place of silocell I might conceivably use characoal not quite so finely divided as that which is used for the major part of the vacuum space. Y

Inasmuch as many changes could be made in the above construction, and many apparently widely different embodiments of my invention could be made without departing from the scope thereof, it is intended that all matter contained in the "above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the language used in the following claims is in tended to cover all the generic and specific features of the invention herein described and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

I claim 1. A vessel having spaced walls defining between them a space which is to be exhausted, the outer wall having an exhaust aperture therein, a mass of finely divided filler for the space immediately overlying the exhaust aperture, and a distinct mass of more finely divided filler for the remainder of the space, and a pad of steel Wool be tween the first named filler and the exhaust aperture, substantially as and for the purposes set forth.

2. In combination, an. inner vessel having a mouth and a bottom, an outer tubular shell surrounding and spaced away from the inner vessel, joined to the inner vessel adjacent the mouth of and extending and open beyond the bottom of the latter, an apertured baffle plate within the open end of the outer shell and spaced away from the bottom of the inner vessel, a closure for the open end of the outer shell, provided with a pump connection, a pad having thecharacteristics of steel wool carried by the baffle plate over the aperture thereof, a filler immediately above the bafile plate having the char *eristics of compacted silocell finely divided, and a filler having the characteristics of finely divided charcoal in the remainder of the space between the, vessel and the outside shell, the last named filler being more finely divided than the first named filler.

In testimony whereof I afiix my signature.

GEORGE C. ANTI-ION. 

